Crank



N0. 6l9,|66. Patented Feb. 7, I899. E. w. GRAGERT.

CRANK.

(Application filed Apr. 29, 1898.)

(No Modal.)

6 & 6226416? by UNITED STATES PATENT OFFICE.

ELMER IV. GRAGERT, OF WHITE ROCK, SOUTH DAKOTA.

CRANK.

SPECIFICATION forming part of Letters Patent No. 619,166, dated February7, 1899.

Application filed April 23, 1898.

' citizen of the United States, residing in the county of Roberts andState of South Dakota, (my post-office address being White Rock, in theState of South Dakota,) have invented new and useful ImprovementsinCranks, of which the following is a specification.

This invention relates to certain new'and useful improvements in meansfor actuating wheels, shafts, &c., the object of my improvement being toprovide a crank connection which will operate more effectively and isdesigned to overcome the pounding of a shaft in its bearings, andconsequently the uneven wearing of the same, the crank being soconnected with a disk, wheel, or shaft that in operation it will exert athrust and pull upon opposite sides of the center or axis of the objectto which it is attached, as will be hereinafter set forth, andspecifically pointed out in the claims.

In the accompanying drawings, illustrating my invention, Figure 1 is .aside elevation showing one manner of applying my invention, and Fig. 2is a modification.

A refers to a drive-wheel or similar structure, as a disk, pulley, orother machine element. To the wheel I attach a suitable triangular frame13, comprising, essentially, bars B, which diverge from each otheradjacent to the point to which the wrist-pin O is connected. Thewrist-pin or bolt 0 may serve as a handle or have attached thereto inthe usual manner a pitman D. The diverging ends of the bars are rigidlyattached to the drive-wheel or disk A, or they may be connected to eachother by a cross-bar B In Fig. l of the drawings I have shown astructure which embodies a triangular frame, and to one of the points orapex of the triangle is attached a wrist-pin, to which the pitman issecured. The other two points or the ends of the hypotenuse of atriangle which are positioned on opposite sides of the disk, shaft, orwheel are provided with openings, through which pass bolts forconnecting the open frame rigidly to the disk or wheel. E refers to aclasp or plate which is adapted to lie over the end or apex of thetriangular frame and prevent its being moved outward or away from thedisk, said plate Serial No. 678,613. (No model.)

merely holding the triangular frame against outward movement, the framehaving no positive or rigid connection at this point with the disk ordrive-wheel, to which the other corners are secured. In Fig. 2 the sameresult is obtained, the cross-bar being dispensed with.

In operation the power or motion from the pitman applied to thewrist-pin will draw upon one member of the frame or side of the triangleand push upon the other. i The points of fixed connection being onopposite sides of the axis will avoid hammering or pounding of the shaftin its bearings, the frame carrying the wrist-pin having a limited rangeof movement sufficient to take up through the frame the shock incidentto the change in direction of the movement of the pitman, and willinsure much smoother running than cranks of ordinary construction. Bythe arrangement described it will be noted that the power applied by thepitman-rod is exerted through the wrist-pin on opposite sides of theaxis, so as to give a more even bearing through the entire revolution ofthe shaft on its axis.

The invention embodies, essentially, di-

verging members, which are fixedly attached to the disk or shaft to beturned, and awristpin carried by the frame adjacent to the point ofjunction, and I consider it desirable that there should be an open spacebetween the shaft and wrist-pin, so that the power exerted may be ondifferent sides of the shaft or the axis thereof.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. As a means for actuating or rotating a drive wheel or shaft, thecombination with a frame comprising diverging bars or members, awrist-pin adjacent to the point of connection of the members with eachother, the opposite ends being rigidly connected to the wheel or shafton opposite sides of the axis thereof, and a clasp or plate attachedadjacent to the periphery of the drive-wheel so as to lie over the endof the frame, substantially as shown and for the purpose set forth.

2. In combination with a drive-wheel, a pitman-attaching framecomprising diverging bars, the ends thereof being attached to thedrive-wheel, a retaining-plate attached to the my hand in presence oftwo subscribing Witdrive-wheel adjacent to its periphery so as tonesses. lie over the conver in ends of the bars of the frame, and a arist-pin which projects ELMER GRAGERT' 5 from the frame and is engaged bythe pit- Witnesses:

man, substantially as shown. G. S. ELLIOTT,

In testimony whereof I have hereunto, set J. Ross OOLHOUN.

